Anyone know about Vauxhall Midi engines?

I've got a '96 one with a 2.4l Izuzu TD engine.

I need to change the fanbelt but it's not immediately obvious what I need to undo to loosen off the alternator. I'm sure it'll be pretty simple but with the engine in the middle it's all a bit of a fanny to get at, leaning over seats and suchlike.

[linked image]